He turned a pleasant face towards me and bade me lay Dolly on the sofa near the flaming burner. Peter Bligh was sitting on a chair, swearing, I fear, as much as he was coughing. Seth Barker, who had the lungs of a bull, looked as though he had found good grass. The fog wasn't made, I do believe, which would harm him. As for the doctor himself, he seemed like a perplexed man who has time for one smile and no more. "The lad will be all right in five minutes," said he, seriously; "there is air enough here, we being five men, for," he appeared to pause, and then he added, "for just three days. After that--why, yes, we'll begin to think after that." I did not know what to say to him, nor, I am sure, did the others. Dolly Venn had already opened his eyes and lay back, white and bloodless, on the sofa. A hissing sound of escaping gas was in the room. I breathed so freely that a sense of excitement, almost of intoxication, came upon me. The doctor moved about quietly and methodically, now looking to his burners, now at the machines. Five minutes came and went before he put another question. "What kept you from the shelter?" he asked, at last. I knew then that he believed us to be Edmond Czerny's men; and I made up my mind instantly what to do. "Prudence kept us, doctor," said I (for doctor plainly he was); "prudence, the same sense that turns a fly from a spider's web. It is fair that you should know the story. We haven't come to Ken's Island because we are Edmond Czerny's friends; nor will he call us that. Ask Mme. Czerny the next time you meet her, and she'll tell you what brought us here. You are acting well towards us and confidence is your due, so I say that the day when Edmond Czerny finds us on this shore will be a bad one for him or a bad one for us, as the case may be. Let it begin with that, and afterwards we shall sail in open water." I said all this just naturally, not wishing him to think that I feared Edmond Czerny nor was willing to hoist false colours. Enemy or friend, I meant to be honest with him. It was some surprise to me, I must say, when he went on quietly with his work, moving from place to place, now at the gas-burner, now at his machine, just for all the world as though this visitation had not disturbed him. When he spoke it was to ask a question about Miss Ruth. "Mme. Czerny," said he, quietly; "there is a Mme. Czerny, then?" Now, if he had struck me with his hand I could not have been more surprised at his ignorance. Just think of it--here was a man left behind on Ken's Island when all the riffraff there had fled to some shelter on the sea; a man working quietly, I was sure, to discover what he could of the gases which poisoned us; a man in Mistress Ruth's own house who did not even know her name. Nothing more wonderful had I heard that night. And the way he put the question, raising his eyebrows a little, and looking up over his long, white apron!